Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

Cooking method for pulp

a technology of lignocellulose and cooking method, which is applied in the field of effective cooking method of lignocellulose material, can solve the problems of no research or development on the type of quinone compound that is effective for cooking and improvemen

Inactive Publication Date: 2006-06-06
KAWASAKI KASEI CHEMICALS LTD +1
View PDF17 Cites 4 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The present invention is a cooking method for pulp using a polysulfide cooking method. This method involves using an alkaline cooking liquor containing polysulfides and a quinone-hydroquinone compound. The oxidation-reduction potential of the quinone-hydroquinone compound during the cooking process is important and should be between 0.12 to 0.25V. This method improves the efficiency and effectiveness of the cooking process for pulp.

Problems solved by technology

However, during the formation of polysulfides, this method produces thiosulfate ions as a by-product which is ineffective for cooking, whereby it has been difficult to produce an alkaline cooking liquor containing highly concentrated polysulfide sulfur at a high selectivity.
However, no research or development has been made on what type of quinone compounds is effective for cooking and for improvement in the yield of pulp or in the required amount of the chemical solutions to be used, in the presence of polysulfides.

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Examples

Experimental program
Comparison scheme
Effect test

example 1

(1) Preparation of a polysulfide cooking liquor

[0042]A two compartment electrolytic cell was assembled, which comprised a nickel plate as an anode current collector, a nickel foam as an anode (100 mm×20 mm×4 mm, average pore diameter of network: 0.51 mm, surface area of the anode per volume of the anode compartment: 5,600 m2 / m3, surface area to the diaphragm area: 28 m2 / m2), an iron expansion metal as a cathode and a fluororesin type cation exchange membrane as a diaphragm. The anode compartment had a height of 100 mm, a width of 20 mm and a thickness of 4 mm, and the cathode compartment had a height of 100 mm, a width of 20 mm and a thickness of 5 mm. The effective area of the diaphragm was 20 cm2. Using model white liquor, circulation electrolysis was carried out at an anode solution linear velocity of 4 cm / sec. at a current density of 6 kA / m2 at an electrolysis temperature of 90° C., whereby a polysulfide cooking liquor having the following composition was obtained at a selectivi...

example 2

[0049]Cooking was carried out in the same manner as in Example 1 except that as a quinone compound, tetrahydroanthraquinone (disodium 1,4-dihydro-9,10-dihydroxyanthracene, SAQ, trade name, manufactured by Kawasaki Kasei Chemicals Ltd.) (Ea=0.154V) was added so that it would be the same molar amount as in Example 1. The results of the cooking are shown in Table 1. Like in Example 1, as compared with Comparative Examples 1 and 2, the Kappa number at the same active alkali addition decreased, and the yield of pulp at the same Kappa number increased.

example 3

[0050]Cooking was carried out in the same manner as in Example 1 except that as a quinone compound, 2-methyl-9,10-anthraquinone (Ea=0.154V) was added so that it would be the same molar amount as in Example 1. The results of the cooking are shown in Table 1. Like in Example 1, as compared with Comparative Examples 1 and 2, the Kappa number at the same active alkali addition decreased, and the yield of pulp at the same Kappa number increased.

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

PropertyMeasurementUnit
concentrationaaaaaaaaaa
concentrationaaaaaaaaaa
concentrationaaaaaaaaaa
Login to View More

Abstract

A lignocellulose material is cooked by means of an alkaline cooking liquor containing polysulfides in the presence of a quinone-hydroquinone compound, of which the oxidation-reduction potential in the form present during the cooking, which potential is a value calculated as a standard oxidation-reduction potential (Ea) with a hydrogen ion activity of 1, is within a range of from 0.12 to 0.25V to the standard hydrogen electrode potential. It is thereby possible to cook the lignocellulose material with a low Kappa number and in good yield and at the same time, to reduce the amount of the chemical solution used and to reduce the load on a recovery boiler.

Description

BACKGROUND OF THE INVENTION[0001]1. Field of the Invention[0002]The present invention relates to a method for cooking a lignocellulose material, particularly to an effective cooking method for pulp, wherein a polysulfide cooking liquor and a quinone compound are used in combination.[0003]2. Discussion of Background[0004]The principal method for producing chemical pulp which has heretofore been industrially employed, is an alkaline cooking method of a lignocellulose material such as wood chip, whereby a kraft method employing an alkaline cooking liquor comprising sodium hydroxide and sodium sulfide as the main components, has been used in many cases. Further, as one of cooking methods to improve the yield of pulp, a so-called polysulfide cooking method is widely known, wherein cooking is carried out by means of an alkaline cooking liquor containing polysulfides. According to this polysulfide cooking method, polysulfide ions oxidize and stabilize terminal aldehyde groups of cellulose ...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Patents(United States)
IPC IPC(8): D21C3/02D21C3/20D21C3/22
CPCD21C3/222D21C3/022
Inventor ANDOH, TATSUYATANAKA, JUNJIWATANABE, KEIGONANRI, YASUNORINAKAO, MAKOTO
Owner KAWASAKI KASEI CHEMICALS LTD
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com